Adjuster for electric light cables.



APPLICATION FILED OCT- 6,1911- Psvtented Apr. 23, 1918.

INVENTOW ATTORNEY NESBI IT, 0 PA'IERSON, NEW JERSEY.

FER 'ELECTBIIGTLIGHT GABLES;

Specification of LetterssPatent.

lPatentedl ltpr. 23', with.

Application filed Dotober 6,1917. Serial No. 135,174.

To all whom it may concern:

Be it known that I, ALEXANDER Nnserr'r, a. citizen of the :United States, residing at Paterson, inthe county of Passaic andState of New Jersey, have invented a certain new and useful Improvement in Adjusters for Electric-Light Cables, of which the following is a specification.

The invention relates to means for lengthening or shortening the "loop in the suspension cable of an electric lamp and thus raising or lowering the latter, and the object of the invention isto provide simple, easily operated means by which the desired variations in the elevation of the lamp maybe effected without abrasive action on the cable tending to fray the covering and damage the insulation, and a further object is to provide means for automatically holding the cable in the adjusted position.

The invention consists in certain novel features and details of construction and arrangement by which the above objects are attained, to be hereinafter described and claimed.

The accompanying drawings form a part of this specification and show two forms of the invention.

Figure 1 is an elevation showing the device supporting an electric lamp cable, and its relation to the latter and the lamp.

The remaining figures are on a larger scale.

Fig. 2 is a side elevation of the device attached to the cable, corresponding to Fig. 1.

Fig. 3 is a plan or top view.

Fig 4 is a vertical section,.taken on the line 4at in Fig. 3, and partly in elevation.

F 5 is a side elevation of a modified form adapted to be fastened directly upon the ceiling or other suitable support.

Similar letters of reference indicate like parts in all the figures.

Referring to Figs. 1 to 4 inclusive, A indicates an incandescent electric lamp bulb attached as usual to a cable A suspended from the ceiling or other support.

B is a casing, shown as a block of fiber, wood, or other nonconducting material, having a vertical tapered dovetailed channel 6 on one face, the wall of which is provided with a vertical groove 6 receiving and partially encircling the cable A1, and C is a tapered dovetailed wedge matching to the channel and forced therein from below. It has avertical groove 0 corresponding to the groove b and completing the 'inclosure of the cable. By slackening the wedge *C the cable is released and the block B moved up or down to a new position on the cable, and when again tightened grasps the cable reliably at the selected heigl'it thereon but without danger of damage thereto.

The block B ishollowed or provided with a pocket 6? in its upper face, in the lower portion of which is a grooved sheave D mounted to revolve on a stud D extending through the block, and E is a lever mounted on a stud E and carrying at its inner end a wheel E having a circumferential ridge c adapted to lie in the groove of the sheave.

The outer end of the lever E extends beyond the block B and is held normally upward by a helical expansion spring F re ceived in a vertical recess 6 in the block and exerting its force to lift the outer end of the lever and hold the wheel E in fricional contact with the sheave D.

G is a cord attached at. one end to the overhung end of the lever E extending thence downwardly in a bight or loop and again upwardly and is passed through a vertical hole b in the block, partially around and over the sheave D and thence downwardly through a second guide-hole b in the block, and its end secured to the cable A at a point considerably below the block, as shown in Fig. 1. The cord thus forms three vertical. members g, g and 9 A continued downward pull on the member g tilts the lever E and lifts the wheel E out of contact with the cord in the groove of the sheave D and permits the lamp A to be raised or lowered through the shortening or lengthening of the member by manipulating the member 9 aided by the gravity of the lamp and cable. On releasing the memher 9 the spring F forces the ridge of the wheel E into strong frictional contact with the cord in the groove of the sheave D and holds the lamp in the adjusted position. The lever E with its wheel E thus serves as a brake for the cord and its sheave.

The form of the invention shown in Fig. 5 is designed to be attached to the ceiling or other support instead of directly upon the cable. In this form the casing B being out of contact with the cable, may be of 1. In a device of the character set forth,

a casing, a sheave therein, a cord traversing said casing and partially around said sheave, and adapted to be attached to a lamp-cable .below said casing, a lever mounted in said casing, a wheel carried by said lever and adapted to engage said cord in its passage over said sheave, a spring arranged to force said lever and Wheel into such engagement,

and means for tilting said lever in opposition to said sprin 2. In a device of the character set forth, a casing, clamping means for adjustably attaching said casing to a lamp-cable, a cord traversing said casing and adapted to be attached to and support said lamp-cable be low said casing, a brake mounted in said casing and arranged to act frictionally on said cord in such traverse, and means for operating said brake.

3. In a device of the character set forth, a casing, clamping means for adjustably attaching said casing to a lamp-cable, a sheave in said casing, a cord traversing said casing and partially around said sheave, and adapted to be attached to said lamp-cable below said casing, a brake mounted in said casing and arranged to act frictionally against said copies of this patent may be obtained for cord and sheave, and means for operating said brake.

4. I11 a device of the character set forth, a casing, clamping means carried by said casing for attaching the latter adjustably upon a lamp-cable, a cord traversing said casing and adapted to be attached to said cable below said casing, a spring-actuated brake mounted in said casing and arranged to act frictionally on said cord in such traverse, and means for operating said brake.

5. In a device of the character set forth, a casing having a vertical tapered dovctailed channel therein and a vertical groove in such channel, a dovetailed Wedge matching in said channel and having a vertical groove therein, serving with said casing to grasp a lamp-cable received in such grooves, a sheave mounted in said casing, a cord traversing said casing and partially around said sheave and adapted to be attached to said cable below said casing, a lever mounted in said casing, a wheel carried by said lever and adapted to engage said cord in its passage over said sheave, a spring in said casing arranged to force said lever and wheel into such engagement, and a cord attached to said lever for tilting the latter in opposition to said sprin In testimony that I claim the invention above set forth I aiiix my signature.

ALEXANDER NESBITT.

five cents each, by addressing the Commissioner of latents.

Washington, D. C. 

